Answer: Whichever one you preferred when you heard them side by side in the same system.
Fact is, only you can decide which you prefer. It's like comparing raspberries and strawberries. I prefer strawberries but there are people who prefer raspberries. Also remember that speakers don't work in isolation. You could have a system which really suits the Monitor Audios, so in your situation the B&Ws wouldn't stand a chance, but the next person might have something that suits the B&Ws...